Don't Add the Extra Weight, The Case for Diving Properly Weighted
The most common thing on any Red Sea dive boat is divers carrying more lead than they need, and most of it gets added in one moment: the weight check passed, but they still cannot sink at the surface, so they clip on more. The fix is descent technique, not lead. What overweighting costs you, how to actually get down from the surface, and why piling on weight leaves you fighting to hold a safety stop on an empty tank.
The most common thing you will see on any Red Sea dive boat is divers carrying more lead than they need. It almost never gets corrected. The diver sinks, the dive happens, nobody questions it. But that extra weight is not free. It quietly costs you air, control, comfort and a margin of safety, on every single dive, and most divers have no idea they are paying for it.
Being properly weighted is not about stripping down to the bare minimum to look like a professional. It is about carrying exactly what you need and not a kilo more. Get it right and almost everything about the dive gets easier: your trim, your air consumption, your ascents, your photos. Here is what the extra weight actually does to you, and how to find your real number.
Why you are probably overweighted
On an open water course, instructors deliberately overweight beginners so they sink easily and stay down. For a first course that is reasonable. The problem is that nobody ever revisits it. You keep diving the same belt for years, in different suits, in different water, with a different body, and you never check the number again that you were handed as a nervous beginner.
The human factors all push the same way. It feels safer to be heavy. Descending is faster and less frustrating with extra lead. And a dive guide handing out weights on a busy boat would far rather you drop straight down than fight at the surface holding the group up. Overweighting is the path of least resistance for everyone involved, which is exactly why it persists.
What the extra weight actually costs
Overweighting is not one problem. It is a chain reaction, and it starts the moment you put on more lead than you need.
The Red Sea makes it easy to get right
Most of the year here you are in a 3mm suit, a shorty, or just a skin. Thin exposure means there is far less neoprene buoyancy to cancel out, so you need less lead than you would in a 7mm in cold water. Plenty of divers bring their cold water weighting habits to the Red Sea and never adjust down, then wonder why they feel clumsy in the warm.
Two things still pull the other way. Salt water is denser than fresh, so you float more and do need a little more lead than you would in a pool or quarry. Factor it rather than guess. And most Red Sea rental tanks are aluminium. An aluminium twelve litre tank is roughly 1.5kg more buoyant empty than full, so as you breathe the gas down you steadily become more buoyant through the dive. That is why you weight for the end of the dive, not the start. If you can hold a safety stop comfortably on 50 bar, you are weighted correctly.
How to find your real number
The weight check takes a few minutes at the end of a dive, and it is about the cheapest improvement you can make to how you dive.
Properly weighted means this. At the end of the dive, with about 50 bar left, an empty BCD and a normal breath, you float at eye level and sink slowly when you breathe out. If you can do that, you are carrying exactly what you need. Anything more is just lead you are paying for with air, effort and control.
When the check passes but you still cannot get down
This is the moment most of the extra lead gets added. The weight check passed, but at the start of the next dive the diver is bobbing on the surface, the group is already going down, and in the rush they clip on another two kilos to make the problem go away. It works, and it is also how a correctly weighted diver becomes an overweighted one. The struggle at the surface is almost never a weight problem. It is a descent technique problem, and it is fixable in a few seconds.
There is a real cost to fixing a descent problem with lead, and it is not just a slightly heavier dive. It can tip you the other way into being underweighted at the worst possible moment. Remember the aluminium tank: it gets roughly 1.5kg more buoyant as you breathe it down. If you piled on weight to sink fast with a full cylinder at the start, you may find that cylinder pulling you toward the surface at the end, when it is near empty and you are trying to hold a safety stop on 50 bar. Being dragged up off your stop at five metres is its own hazard, and it is the part of the dive where staying put matters most. The answer is not more lead. It is a full exhale and a kick or two to get you under, and the right amount of weight so you are neutral when the tank is empty.
The divers you quietly envy, the ones who seem to do nothing and go nowhere they do not intend, are rarely the strongest or the most obviously experienced. They are usually just correctly weighted and well trimmed. It costs nothing but a few minutes at the end of a dive, and almost nobody bothers to do it. Be the diver who bothers.
Empty BCD, normal breath, float at eye level. That is correctly weighted. Sinking on a held breath means you are carrying too much.
Do the weight check at the end of the dive, with a nearly empty tank. That is when you are most buoyant and the number actually matters.
An aluminium 12L tank is about 1.5kg more buoyant empty than full. You get lighter through the dive, so weight for the end of it.
In a 3mm, shorty or skin there is far less neoprene to offset than a 7mm in cold water. Adjust down for the Red Sea.
Drop weight gradually and reassess each dive. Most divers can lose two to four kilos and notice only an easier dive.
A full exhale, an empty BCD and a kick or two get you under the surface. The struggle to sink is usually technique, not weight.
Fighting trim and too much air in the BCD can quietly burn ten to twenty percent of your bottom time.
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